Global Positioning System (GPS) applications to geophysics and geology. Emphasis on rapid survey techniques and special attention to the problem of using GPS ellipsoid heights for land surveys. Applied in-house geoid modeling to corrections to heights in geosciences applications. Building a centimeter accuracy geoid model for the Texas Gulf Coast with UT-Austin and Texas A&M tied to tidal gauges for coastal hazard studies and mapping of sea level.

Developing new digital data acquisition (mapping) techniques using field computers, GPS, GIS and reflectorless laser rangefinders in which both high resolution terrain and specific geologic feature (bedding, faults, etc.) mapping is carried out. Development of real time geological analysis (such as stratigraphic thicknesses, strikes and dips) in the field.